Moran played Joanie on the legendary sitcom, and already her former costars have been paying tribute to her on social media. Ron Howard, who played Richie, tweeted, “Such sad sad news. RIP Erin. I’ll always choose to remember you on our show making scenes better, getting laughs and lighting up tv screens.”

Henry Winkler, aka The Fonz as Happy Days fans know him, felt the same. “OH Erin… now you will finally have the peace you wanted so badly here on earth,” he tweeted.

OH Erin... now you will finally have the peace you wanted so badly here on earth ...Rest In It serenely now.. too soon

Moran’s character was popular on the show, leading to a spinoff called Joanie and Chachi about her relationship with the character played by Scott Baio. The spinoff only lasted 17 episodes, though, and after it ended Moran’s career as a leading lady was effectively over. She had some roles in TV and a part recently in Not Another B Movie, but she wasn’t working at the time of her death.

Baio and Howard and other cast members continued to work, but it was difficult for Moran to find parts. After a while, at age 22, she left Hollywood behind and went to live in the California mountains to get away from it all.

It wasn’t easy for Moran to grow up on the set of Happy Days. According to The New York Times, when she was just 15 years old producers on the show pressured her to lose weight and play her character “more sexy.” Later in life, Moran said that she suffered from depression. She told the Toronto Star in 1988:

“I wanted time off to reassess my life and career. I had to ask myself, ‘Do I really want to keep doing this, or do I want to sit back and take it easy for five years, 10 years?'”